JPH0326281U - - Google Patents
Info
- Publication number
- JPH0326281U JPH0326281U JP8590289U JP8590289U JPH0326281U JP H0326281 U JPH0326281 U JP H0326281U JP 8590289 U JP8590289 U JP 8590289U JP 8590289 U JP8590289 U JP 8590289U JP H0326281 U JPH0326281 U JP H0326281U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- turns
- source
- power mosfet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Control Of Voltage And Current In General (AREA)
- Dc-Dc Converters (AREA)
Description
第1図は本考案の第1の実施例を示す回路図、
第2図は第1図に示された実施例の動作を説明す
るための各部信号のタイミングチヤート、第3図
は本考案の第2の実施例を示す回路図、第4図は
従来の過電流防止回路の一例を示す回路図である
。
1……スイツチ回路、2……検出回路、3,3
A……制御回路、4……検出制御回路、10……
負荷回路、Q1……パワーMOSFET、Q2〜
Q4……MOSFET、R1〜R5……抵抗、S
R1……サイリスタ。
FIG. 1 is a circuit diagram showing a first embodiment of the present invention;
Fig. 2 is a timing chart of various signals for explaining the operation of the embodiment shown in Fig. 1, Fig. 3 is a circuit diagram showing the second embodiment of the present invention, and Fig. 4 is a conventional circuit diagram. It is a circuit diagram showing an example of a current prevention circuit. 1... Switch circuit, 2... Detection circuit, 3, 3
A...Control circuit, 4...Detection control circuit, 10...
Load circuit, Q1...Power MOSFET, Q2~
Q4...MOSFET, R1-R5...Resistance, S
R1...thyristor.
Claims (1)
を供給するパワーMOSFETを備えたスイツチ
回路と、前記入力信号に従つて前記パワーMOS
FETのオン、オフよりやや送れてオン、オフす
るMOSFETを備え前記パワーMOSFETの
ソース、ドレイン間の電圧を検出してこのソース
、ドレイン間の電圧と対応した検出電圧を出力す
る検出回路と、前記検出電圧に応じてオン、オフ
するスイツチ素子を備え前記パワーMOSFET
のゲート、ソース間の電圧を制御する制御回路と
を有することを特徴とする過電流防止回路。 a switch circuit including a power MOSFET that turns on and off according to an input signal and supplies current to a load circuit;
a detection circuit that includes a MOSFET that turns on and off at a slightly higher speed than the on and off power MOSFETs, detects the voltage between the source and drain of the power MOSFET, and outputs a detected voltage corresponding to the voltage between the source and drain; The power MOSFET is equipped with a switch element that turns on and off depending on the detected voltage.
An overcurrent prevention circuit comprising: a control circuit for controlling a voltage between a gate and a source.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1989085902U JPH087831Y2 (en) | 1989-07-21 | 1989-07-21 | Overcurrent protection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1989085902U JPH087831Y2 (en) | 1989-07-21 | 1989-07-21 | Overcurrent protection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0326281U true JPH0326281U (en) | 1991-03-18 |
JPH087831Y2 JPH087831Y2 (en) | 1996-03-04 |
Family
ID=31635264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1989085902U Expired - Lifetime JPH087831Y2 (en) | 1989-07-21 | 1989-07-21 | Overcurrent protection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH087831Y2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998053951A1 (en) * | 1997-05-30 | 1998-12-03 | Fanuc Ltd | Synchronous motor for driving main spindle |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63318781A (en) * | 1987-06-22 | 1988-12-27 | Nissan Motor Co Ltd | Mosfet with overcurrent protective function |
-
1989
- 1989-07-21 JP JP1989085902U patent/JPH087831Y2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63318781A (en) * | 1987-06-22 | 1988-12-27 | Nissan Motor Co Ltd | Mosfet with overcurrent protective function |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998053951A1 (en) * | 1997-05-30 | 1998-12-03 | Fanuc Ltd | Synchronous motor for driving main spindle |
Also Published As
Publication number | Publication date |
---|---|
JPH087831Y2 (en) | 1996-03-04 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term |